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We recently discovered that NGC 3201 has characteristics that set it outsidethe current twofold classification scheme for Galactic globular clusters (GCs).Most GCs are mono-metallic and show light-element abundance variations (e.g.,Na-O and C-N anti-correlations); but a minority of clusters also presentvariations in Fe correlating with s-process element and C+N+O abundances, andthey possess multiple C-N sequences. These anomalous GCs also have a broadsub-giant branch (SGB) and follow the same mass-size relation as dwarf galaxiespossibly evolving into GCs. We now revealed that NGC 3201 belongs to neithergroup. It has multiple C-N sequences, but no broad SGB, no strong evidence of aFe-spread, and it does not follow the mass-size relation.

Breaking the dichotomy between typical and anomalous globular clusters: the case of NGC 3201